Improvement in miter-boxes



McKlNsTnY & w.` wALDEN.

Miter-Boxes.

No. 135,832. PatentedFe'muJwa.

AM PHom-mwasmrmc co. Mmm/mele mams) UNITED STATES PATENT OFFICE.

JOHN A. MCKINSTRY AND WILLIAM VVALDEN, OF SPRINGFIELD, MASS.

IMPROVEMENT IN MlTER-BOXES.

Specification forming part ofLetters Patent No. 135,532, dated February 11,1873.

To ali whom it may concern:

Be it known that we, JOHN A. MoKINsTRY and WILLIAM WALDEN, of Springfield, in the countyT of Hampden and State of Massachusetts, have made certain Improvements in Miter Boxes, of which the following is a specification:

In the accompanying drawing, Figure l is a top view of a miter-box with our improvements attached. Fig. 2 is a vertical transverse section ofthe same. Fig. 3 is a section on the line x x, Fig. 2. y

Our invention consists of arevolving clamp or wedge-shaped cam for setting the sawguides at any desired angle or fraction of a degree. Our miter-box may be of the general form shown in thepatent granted by the United States in 1866 to the above mentioned J oHN A. MOKINSTEY.

In the accompanying drawing, the bottom or bed ot the miter-boxv is shown at A. )n the back side of the box is a revolving post, B, with a slot, I), for Vguiding the saw. On the front of the box is another post, C, so arranged as to slide or travel along the front bar of the box, and at the same time revolve, and thus keep the slot c of this post in a line corresponding to the slot bin the post B. By this arrangement these two slotsl or sawguides will not bind upon the saw when the front post is moved. The two posts B and G are connected by a swinging extension-arm,

D, and a sliding rod, E, by which means the two'posts or the saw-guides therein are kept in line for guiding the saw, as j ust mentioned above. The slide F has a hook, f, which takes hold of the upper and wedge-shaped edge of the front bar G. This slide is provided with two slightly-movable catches, H, the lower ends of which hook upon the inside of the front bar of the box, while their upper ends hook upon the revolving clamp or wedges I. This revolving clamp is cast with a central ring of metal, I, embracing the front post, and with two wedges, 1, Fig'. l. `This cam is revolved by placing the hand upon the handle As the cam tightens or the wedges I draw up the catches H, the slide F is pushed down, and the hook f bites upon the wedgeshaped edge of the front bar G. Thus all the parts are immovably locked by the clamp. By turning the clamp backward the slide F and post C are again released. Upon the straight bar G is a graduated scale, which may be marked by degrees so as to set the saw at any desired angle or fraction of a degree.

Our clamp may be applied to circular or curvedy machines.

Having described our invention, we claimln combination with a miter-box, the cam or clamp for setting the saw-guides at any desired angle or fraction of a degree, substantially as set forth.

J. A. MGKINSTRY. VILLIAM WALDEN. XVitnesses: g

DANIEL BREED, EDM. F. BROWN. 

